How to Find and Vet Subcontractors: A Contractor's Checklist

Finding a subcontractor is easy. Finding one who shows up, holds a current license, carries real insurance, and finishes is the hard part. Vet every candidate the same way: verify license, insurance (COI), references, and crew capacity for your dates — then lock scope and price in writing before anyone steps on site.

This is general information for contractors, not legal or insurance advice. Run anything with contract or liability stakes past your own attorney or agent.

Where to find subcontractors

Cold-searching the internet is the slowest path. Start where the signal is highest:

Referrals from trades you already trust. Your electrician knows good drywall crews. Ask. A warm intro skips half the vetting.
Supply houses and rental yards. Counter staff see who buys quality material and who runs a tight operation.
Trade-to-trade marketplaces. Platforms built for execution-phase coordination — not gig labor or job boards — let you see who has crews actually available for your dates and trade.
Local trade associations and union halls for licensed, vetted talent in regulated trades.
Your own past projects. The sub who did clean work two jobs ago should be your first call.

The goal isn't a giant list. It's two or three real candidates you can vet properly. On a marketplace like SKILLS, you post a Crew Needed Posting and field structured Coverage Offers from organizations — real businesses, not anonymous individuals — which front-loads a lot of the vetting before you ever talk.

What to verify before you hire

Treat this as a hard gate. No verification, no agreement. Here's the checklist.

1. License and registration

Confirm the license is active and unexpired for the specific trade and scope — not just "they have a license."
Verify it covers your jurisdiction. License rules vary by state, county, and city.
Match the license name to the business name on your paperwork. Borrowed or "qualifier" licenses are a real problem in some trades.
For specialty work, confirm the classification is right (e.g., a general license doesn't always cover low-voltage or HVAC).

2. Insurance (the COI)

A Certificate of Insurance is your single most important document. Don't accept a screenshot of an old one.

Request a current COI naming your company as additional insured for the project.
Confirm general liability limits meet your job's requirements and your own GL's expectations.
Check workers' comp coverage — if a sub's worker gets hurt and there's no comp, the claim can roll uphill to you.
Verify the policy dates cover your entire work window, not just the day they sent it.

Send a clean, standardized request so nothing gets missed. Our Certificate of Insurance Request tool generates a ready-to-send ask with the right fields, and a Compliance Vault stores COIs, licenses, and certifications so verified subs can share status without re-sending paperwork every job.

3. References and past work

Call two or three recent references — ideally GCs or contractors, not just homeowners.
Ask the question that matters: "Would you hire them again, and for what?"
Probe schedule reliability specifically: did they show up on the days they committed?
Look at work in your scope, not their portfolio highlight reel. A great tile sub may be average at large-format.

4. Capacity and fit

The most overlooked check. A great sub who's already booked solid is useless to your deadline.

Confirm they have crew available for your actual dates — not "we'll figure it out."
Match crew size to the work. A two-person crew can't frame a building on your timeline.
Confirm they've done work at your scale before.
Gauge communication speed. Slow to respond during vetting means slow on site.

Red flags that should stop you

Any one of these warrants a pause. Two or more, walk away.

Won't provide a COI or current license — or stalls when you ask.
Cash-only, no paper, no written scope. If it can't be documented, it can't be defended.
A bid dramatically below everyone else. Lowball pricing usually means corners, change-order games, or a crew that vanishes mid-job.
Vague on dates or crew size. Reliability problems start here.
Bad-mouths every past GC. Sometimes it's them. Usually it's a pattern.
No business entity — just an individual with a truck. Fine for some work, a liability for licensed scope.

On structured platforms, anti-lowball guardrails (offer floors, rate caps, submission limits) and verification tiers — Basic → Trusted → Verified Pro — filter out a lot of this before it reaches you. If a term here is new, the glossary defines the contractor-native language.

How to lock the deal

Verification gets you a good candidate. A written agreement gets you accountability.

Define the scope in plain language. What's included, what's not, who supplies material.
Put price and pay terms in writing — hourly, flat, or bid; deposit, draws, retention.
Set the schedule and crew commitment — start date, dates on site, crew size.
Sign before work starts. A handshake isn't disputable.

Don't draft from scratch. Start with our Subcontractor Agreement Template and adapt it. On SKILLS, accepting a Coverage Offer creates a Work Agreement — an immutable, server-authoritative, audit-logged snapshot ("Locked In") — so the terms both sides agreed to can't quietly change later. See how it works for the full lifecycle, or pricing for what's free versus Pro.

Quick answers

What's the single most important thing to verify in a subcontractor? A current Certificate of Insurance naming you as additional insured, with active workers' comp. Without it, a single injury or claim can land on you.

How do I check if a subcontractor's license is valid? Verify it's active, unexpired, correctly classified for the scope, and valid in your jurisdiction — usually through your state or local licensing board's online lookup. Match the license name to the business name on your paperwork.

What's a major red flag when hiring a subcontractor? A bid far below everyone else's, combined with reluctance to provide a COI, license, or written scope. Suspiciously cheap plus no paperwork almost always costs more later.

Should I always have a written subcontractor agreement? Yes. Define scope, price, schedule, and crew size in writing and sign before work starts. A written agreement is what makes the deal defensible.

The bottom line

Good subs aren't found, they're verified. Run every candidate through the same gate — license, insurance, references, capacity — watch for the red flags, and lock scope and price in writing before the first crew arrives. Do that consistently and you stop gambling on who shows up.

SKILLS is built to make this routine: post what you need, field structured offers from real businesses, see verification tiers up front, and lock terms in an audit-logged Work Agreement. Join the waitlist to staff your next job with subs you've actually vetted.